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The nacelles are essentially cylinders cut in two and then a narrow section added between the two halves. The pylon joins the nacelle at a correct angle for the cylinder on that side. The centreline of the pylon goes straight to the radial centre of the cylinder on that side. it looks unusual because the cylinder has been cut in half and a narrow centre section placed between the two halves.

Yes, it does look unusual. When I was first sletching this out I came up with the design of the nacelles first, Then I looked for a way to connect them to the secondary hull. I toyed with having the pylons connect to the underside of the naclles (which are not truly flat on the top and bottom, but very subtly curved), but it just didn't look right and the angle of the pylons would be too shallw. Also if the pylons connect to the secondary hull too low it also looks wrong. When I envisioned my eventual solution I found the unusual appearance appealling.

It should be noted, too, that despite appearances the support pylons of the TOS E do not connect to the nacelles in the expected fashion either. They actually connect lower, more underneath the nacelle, than one would naturally assume.

This wasn't a critique on the modelling-aspect of this mesh.
It's just that the angles don't all correspond very well with each other; the shape of the pylons makes it look like they are rotated inwards on the aft edge. They aren't, but the effect occurs because the pylons get so wide, and the nacelles taper in so much were they intersect.
The same effect occurs at the sec-hull/pylon intersection; on the Refit-Enterprise this is avoided by a relatively wide pylon-base.

The base of the refit pylons are a lot smaller where they attach to the secondary hull than where they meet the nacelles. The difference between the two attach points is a lot greater than what I've done. In fact that was one of the criticisms of the refit design.

Look at the Refit again. The actual base is quite wide/long, it gets quite a bit smaller above the base before flaring out again.
THAT base has a totally different shape than the pylon itself, thus avoiding that rotated look your pylon seems to have at the intersection-point, because the shape of your pylon-base conforms to the shape of the your pylon.

I get you. Firstly, I'm not done yet. And secondly the narrow point of the refit pylons really looks like a weak point. Remember also that these ships aren't exposed to the same gravitational stresses as on object built on a planet surface with a gravity envelope always pulling down.

Besides a bit of detailing what's changed is the entire saucer superstructure and the curvature of thw saucer's upper surface.

I felt the curvature of the top of the saucer was off and so I remade the whole thing to be a bit less pronounced. It's hard to see unless you compare it right against the original shape, but I feel the change does look better. The Bridge area has also been redone. It is distinctly lower in profile and more rounded. The Bridge still sits recessed under the upper dome but, of course it doesn't take up nearly as much space as there is under that dome. There could be about half to almost a full deck of space between the ceiling of the Bridge and the topmost outer surface of the dome. The pill shape aft of the dome is the extensive upper space and planetary sensor array. You can see a strip of white on the top that will be lighted in place of the usual familiar lighted dome. I'm thinking of something similar on the saucer's lower sensor array.

There is a bit of detailing on the support pylons that may look like windows, but they're actually additional external sensors, possibly monitoring the warp field. Although they're sensors I mimicked the three dark rectangles on the outboard sides of the TOS E's support pylons. The detail protrudes very slightly from the surface of the pylon rather than being flush like a window would have been. Besides, although there are access ways through the pylons to reach the nacelles they are not meant to be accessible while the main engines are powered. So for all intents and purposes those pylons are uninhabitable parts of the ship unless the nacelles are completely powered down or under rare and extreme circumstances.

Eventually I am going to try to add a small radius where the dorsal attached to the secondary hull so that it will look more like a smooth integration of the two components. I did the same with the domes of the saucer structure to merge them smoothly into the top of the saucer. My idea was that this detail might suggest different and advanced construction techniques.

And for anyone who is curious, yes, I did make the nacelles maybe ten percent larger than they were originally drawn.

The project is evolving very well.
My suggestion is to move the neck and saucer a bit more to the front, and to increase the naceles size a little too. It will give her proportions similar to their old sisters, as to have a better appearance when rendered in some views.

__________________
One of the great revelations of space exploration is
the image of the earth, finite and lonely bearing the entire human species through the oceans of space and time. ~ Carl Sagan (1934-1996)

The project is evolving very well.
My suggestion is to move the neck and saucer a bit more to the front, and to increase the naceles size a little too. It will give her proportions similar to their old sisters, as to have a better appearance when rendered in some views.

When viewed in perspective the nacelles will look larger. This similar to when you see elevation drawings of a car and the wheels might look smaller than they do when seen in perspective. When I originally designed this I moved that dorsal and secondary hull back and forth until I hit had a spot I thought worked better than the others.

Any semblance to previous designs I leave after a point considering this is a different continuity and also to reflect a degree of alien influence.

Slowly working the details. You can see the impulse housing and I've begun to detail the anti-grav impulse hardware. There will be more bits going into there. You can also see the lower sensor array on the underside of the saucer. I've also shortened the prow of the secondary hull just a little so now it's a bit less prominent. It's also been tempered by the beginning of detail that will eventually fit into the underside of that area.

Oh, and I can say with assurance that there won't be any gridlines added to this.

Some progression. Gradually adding the bits that flesh the design out. I think it's beginning to look like more realized and less like a concept sketch. If my progression seems glacial it's because I'm now getting into details I hadn't conceived intially and now I want to add things that compliment the design as best as I can without just slathering things on.

The approach I'm taking is a reflection of how I saw the TOS Enterprise in my mind's eye all those years: clean, sleek, not overly cluttered and interesting shapes suggestiong advanced and powerful technology.